NO HEAT

1995 Buick Lesabre • 165 miles

I HAVE 1995 BUIcK LESABRE 160k, has climate control when I turn on heat the air comp. Kicks on immediately and warm not hot air comes out of the driver side vents, and cold a/c cold air comes out of right side vents. Also the temp display on dash flashes for about 30 seconds then stays on steady as it should needless to say my wife is not happy with her side of the car on a cool morning. Could anyone help TIA DAVE